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题目材料：
According to data collected in England in the early nineteenth century, children working in coal mines were much shorter than other children of the same ages. Since the coal mines had many tight spaces, a frequent explanation has been that mine managers would have avoided employing tall children. Some scholars have rejected this explanation, pointing out that since exposure to sunlight is necessary for the body`s production of a growth hormone, deprivation of sunlight probably caused child miners growth to be stunted. But, clearly, the true explanation is that both of these factors were at work. For one thing, they can in fact operate independently. More importantly, the differences in children's heights were so extreme that neither explanation alone would account for them satisfactorily.
以上解析由 考满分老师提供。
